BackBox

BackBox is a Linux distribution for penetration testers based on Ubuntu.It is one of the lightest and fastest Linux distros that are currently available on the Internet.It uses the Xfce component for the desktop environment and is suitable for web application analysis,network analysis,vulnerability assessments and penetration tests.

The interesting part with the BackBox team is that if there is a tool that is not inside the repositories you can make a request and they will include it.